Hi Matthew and Timo, I've tried both these kernels in our test environment (uname -rv outputs listed):
1) 5.15.0-88-generic #98+TEST2043118v20231110b1-Ubuntu SMP Fri Nov 10 10:00:22 UTC 20 Works for us, that is: does not have the issue this bug report is about. 2) 6.6.0-060600rc5-generic #202310081731 SMP PREEMPT_DYNAMIC Thu Nov 16 04:38:01 UTC 2023 Still has the failing CIFS-mounted DFS filesystem. FWIW, running the 6.2.0-36-generic kernel from the jammy repositories, executing "ls -l" to access the (autofs mounted) file system hangs. Whereas doing the same while running the 6.6.0-060600rc5-generic it just fails after about 10 secs. Best regards, Heiko -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2043118 Title: Regression CIFS mounted DFS Status in linux package in Ubuntu: New Status in linux source package in Jammy: Incomplete Bug description: On Ubuntu 22.04.3 LTS (jammy jellyfish) we mount a DFS file service using CIFS with kerberos authentication. After the kernel upgrade from 5.15.0-86-generic to 5.15.0-88-generic (exact version: 5.15.0-88.98) this stopped working. The mount seems to have worked, but files and directories are inaccessible. A non-DFS CIFS share mounted on the same client machine is not affected. In our case the filesystem is mounted using autofs with the following mapping: /dfs-share -fstype=cifs,sec=krb5,vers=3,multiuser,noserverino ://example.com/share Kernel log messages: CIFS: Attempting to mount \\example.com\share CIFS: VFS: BAD_NETWORK_NAME: \\example.com\share CIFS: VFS: Verify user has a krb5 ticket and keyutils is installed CIFS: VFS: \\CLx-Ny.EXAMPLE.COM Send error in SessSetup = -126 We confirmed that kernel version 5.15.0-88 causes this by booting different kernel versions repeatedly. When booting 5.15.0-86 everything worked properly as before. Though not familiar with kernel coding, we found changes in the source code that seem to confirm that some code dealing with DFS has changed, moved, or removed. After: git clone git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/jammy This: git diff Ubuntu-5.15.0-86.96 Ubuntu-5.15.0-88.98 -- fs/cifs/cifs_dfs_ref.c This suggests the function cifs_dfs_do_mount() has been (re)moved. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2043118/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
